星载SAR成像与SAR图像中一些不确定性因素分析

SAR成像中的不确定性因素不仅影响SAR成像质量,还给SAR图像的解译与应用带来困难。为了改善这些不确定性,从SAR成像的原理和过程出发,深入分析和探讨星载SAR成像与SAR图像中的多普勒参数估计、距离迁徙、斑点噪声和后向散射系数所产生的不确定性及带来的影响,并对部分不确定性提出相应的改善方法。利用实测ERS-2数据进行成像实验,实验结果显示SAR成像中的不确定性可以尽量得到改善,这对进一步研究SAR成像和应用有着实际意义。

Analysis of Some Uncertain Factors in Spaceborne SAR Imaging and SAR Image

The uncertain factors of Synthetic Aperture Radar(SAR) imaging not only impact SAR imaging,but also obstruct the interpretation and application of SAR images.In order to improve the uncertainties,this paper makes a detail analysis and discussion about the uncertainties and influences in spaceborne SAR imaging and SAR image,brought by Doppler parameter estimations,range migrations,speckle noise and backscattering coefficients,from SAR imaging principles and processes.Furthermore,some corresponding improved methods are proposed for part uncertainty.Experiments were done with the raw data of ERS-2,and the experimental results show that the uncertainties may be improved as soon as possible.This is very significant for further studying SAR imaging and applications.